Locally refined discrete velocity grids for stationary rarefied flow simulations
Language
en
Article de revue
This item was published in
Journal of Computational Physics. 2014, vol. 257, n° 15, p. 572-593
Elsevier
English Abstract
Most of deterministic solvers for rarefied gas dynamics use discrete velocity (or discrete ordinate) approximations of the distribution function on a Cartesian grid. This grid must be sufficiently large and fine to describe ...Read more >
Most of deterministic solvers for rarefied gas dynamics use discrete velocity (or discrete ordinate) approximations of the distribution function on a Cartesian grid. This grid must be sufficiently large and fine to describe the distribution functions at every space position in the computational domain. For 3-dimensional hypersonic flows, like in re-entry problems, this induces much too dense velocity grids that cannot be practically used, for memory storage requirements. In this article, we present an approach to generate automatically a locally refined velocity grid adapted to a given simulation. This grid contains much less points than a standard Cartesian grid and allows us to make realistic 3-dimensional simulations at a reduced cost, with a comparable accuracy.Read less <
English Keywords
rarefied flow simulation
hypersonic flows
re-entry problem
transition regime
BGK model
discrete velocity model
Origin
Hal imported